Display Driving Module ESD Protection Segmentation
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Solution Overview
Problem
Conventional methods for improving electrostatic discharge (ESD) protection in display driving chips are insufficient, as they increase the chip's area cost and do not provide adequate practical application.
Innovation Solution
The implementation of a display driving module with both first and second ESD protection devices, where the second ESD protection devices are strategically placed in the driving circuit portion, non-driving circuit portion, system circuit block, or display panel to cooperate with the first ESD protection devices and provide additional discharge paths, utilizing signal routing to connect with package test pads for effective ESD protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the layout area of original ESD protection devices inside the display driving chip is directly adjusted, then the capability to withstand electrostatic discharge is improved, but the area cost for the display driving chip is significantly increased
Solution Approach 1:
The ESD protection function is segmented into two parts: first ESD protection devices integrated within the display driving chip and second ESD protection devices located externally in the driving circuit portion. This segmentation allows the chip itself to remain compact while distributing the ESD protection function across multiple components, thereby improving overall ESD capability without significantly increasing chip area cost.
Solution Approach 2:
The patent introduces second ESD protection devices as intermediary components located in the driving circuit portion, which cooperate with the first ESD protection devices. These intermediary devices provide additional discharge paths without requiring enlargement of the original chip layout, thus improving ESD protection capability while maintaining cost-effectiveness.
2Reliability
If more ESD protection devices are added to improve ESD protection capability, then the discharge path capability is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges the ESD protection function into existing circuit structures by placing second ESD protection devices in the driving circuit portion that already contains driving channels and signal routing. This integration approach allows multiple ESD protection devices to work together without proportionally increasing overall device complexity, as they share infrastructure such as signal routing and test pads.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the capability for ESD protection while maintaining cost-effectiveness, effectively guiding electrostatic discharge away from the display driving module during tests.
Implementation Method 1
an ESD protection test is usually required after manufacturing process of a display driving chip for driving a display panel is completed. The ESD protection test includes, for example, inputting a test signal to a test pad, so as to test a capability to withstand electrostatic discharge for the display driving chip.
Data Source
AI summary
A display driving module including a driving circuit portion and a non-driving circuit portion is provided. The driving circuit portion is controlled by a system circuit block. The driving circuit portion includes driving channels for driving a display panel. First ESD protection devices are disposed in the driving circuit portion corresponding to the driving channels for providing at least one discharge path. The non-driving circuit portion electrically connects the system circuit block, the driving circuit portion and the display panel. At least one of second ESD protection devices is disposed in at least one of the driving circuit portion, the non-driving circuit portion, the system circuit block and the display panel corresponding to the first ESD protection devices. The second ESD protection devices cooperate with the first ESD protection devices to provide the discharge path. An image display system including the foregoing display driving module is also provided.